原位聚合二胺盐液晶单体及其聚合物电化学性能的研究

Synthesis and Electrochemical Characterization of Polymers Obtained by In situ Polymerization Based on Diammonium Liquid Crystal Monomer

以苯甲酸联苯酯为基元,制备二胺盐液晶单体。对液晶单体紫外光致原位聚合制备出具有离子传导功能的聚合物。通过FT IR和~1H NMR对其结构进行了表征。通过电化学工作站测试其电阻并计算出不同温度下的离子传导率。结果表明,由于液晶态下分子结构的有序排列,二胺盐液晶单体在液晶态的传导率高于固态的传导率,并且传导率随着温度的升高而上升,在170℃达到最大值,为1.30×10^(-5)S/cm。二胺盐聚合物在95℃下传导率达到1.02×10^(-5) S/cm。通过原位聚合使聚合物保留单体在液晶态时的分子有序排列,获得在中低温条件下传导率接近液晶相下传导率的聚合物材料。

Diammonium liquid crystal monomer was prepared based on biphenyl benzoate mesogen so that ionic conductive polymer was obtained by in situ ultra-violet（UV）photo-polymerization of liquid crystal monomer.The chemical structure was characterized by FTIR and ~1H NMR.Electrochemical impedance spectroscopy measurements determined the ionic conductivity of polymers.The results showed that the ionic conductivity of liquid crystal monomer in the mesomorphism is higher than that in the solid state owing to the ordered molecular structure in the liquid crystal phase.The ionic conductivities increase with the temperature and the maximum ionic conductivity of the monomer is 1.30×10^-5 S/cm at 170 ℃.The ionic conductivity of the polymer is 1.02×10^-5 S/cm at 95 ℃,close to the conductivity of the monomer in the liquid crystal phase.The ordered molecular structure of the monomer can be fixed by in situ polymerization.